Number of ways to place n nonattacking composite pieces queen + rider[1,3] on an n X n chessboard.

A189873

Number of ways to place n nonattacking composite pieces queen + rider[1,3] on an n X n chessboard.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =4a(10) =56a(11) =18a(12) =116a(13) =112a(14) =408a(15) =916a(16) =2400a(17) =7228a(18) =27368a(19) =111478a(20) =445644a(21) =1674860a(22) =7624368a(23) =38737270a(24) =178933064

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